PIC18F2220 Datasheet, PDF (107/388 Pages) Microchip Technology – 28/40/44-Pin High-Performance, Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

PIC18F2220/2320/4220/4320
FIGURE 10-7:
BLOCK DIAGRAM OF
RB2:RB0 PINS
RBPU⁽²⁾
Analog Input Mode
Data Bus
WR LATB
or PORTB
D
Q
CK
Data Latch
D
Q
VDD
P
Weak
Pull-up
I/O pin⁽¹⁾
WR TRISB
RD TRISB
CK
TRIS Latch
TTL
Input
Buffer
RD LATB
Q
D
RD PORTB
INTx
Schmitt Trigger
Buffer
ENEN
To A/D Converter
Note 1: I/O pins have diode protection to VDD and VSS.
2: To enable weak pull-ups, set the appropriate TRIS
bit(s) and clear the RBPU bit (INTCON2<7>).
FIGURE 10-8:
BLOCK DIAGRAM OF
RB4 PIN
RBPU⁽²⁾
Data Bus
WR LATB
or PORTB
Data Latch
DQ
CK
TRIS Latch
DQ
VDD
P
Weak
Pull-up
I/O pin⁽¹⁾
WR TRISB
CK
TTL
Input
Buffer
RD TRISB
RD LATB
RD PORTB
Set RBIF
Latch
QD
EN
Q1
From RB7:RB5
To A/D Converter
QD
RD PORTB
EN
Q3
Note 1:
2:
I/O pins have diode protection to VDD and VSS.
To enable weak pull-ups, set the appropriate TRIS bit(s)
and clear the RBPU bit (INTCON2<7>).
FIGURE 10-9:
BLOCK DIAGRAM OF RB3/CCP2 PIN
Port/CCP2 Select
CCP2 Data Out
RBPU
Analog Input Mode
RD LATC
0
Data Bus
D
Q
1
WR LATB
or PORTB
CK
Data Latch
D
Q
WR TRISB
CK
TRIS Latch
VDD
P
N
VSS
VDD
P
Weak
Pull-up
TTL Input
Buffer
RB3 pin⁽¹⁾
RD TRISC
Q
D
RD PORTB
CCP2 Input
Analog Input Mode
To A/D Converter
Note 1: I/O pins have diode protection to VDD and VSS.
ENEN
Schmitt
Trigger
 2003 Microchip Technology Inc.
DS39599C-page 105